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  Subjects -> CHEMISTRY (Total: 849 journals)
    - ANALYTICAL CHEMISTRY (47 journals)
    - CHEMISTRY (604 journals)
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ANALYTICAL CHEMISTRY (47 journals)

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Accounts of Chemical Research     Full-text available via subscription   (Followers: 93)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 27)
American Journal of Analytical Chemistry     Open Access   (Followers: 31)
Analytica Chimica Acta     Hybrid Journal   (Followers: 39)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32)
Analytical Chemistry     Full-text available via subscription   (Followers: 242)
Analytical Chemistry Insights     Open Access   (Followers: 22)
Analytical Chemistry Research     Open Access   (Followers: 7)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access   (Followers: 2)
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 25)
Current Analytical Chemistry     Hybrid Journal   (Followers: 7)
Drug Testing and Analysis     Hybrid Journal   (Followers: 6)
Electroanalysis     Hybrid Journal   (Followers: 6)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 21)
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 5)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 5)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 23)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 9)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 54)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 13)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.268]   [H-I: 23]   [21 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2335 journals]
  • A chromatography-mass spectrometry study of aquatic chlorination of
           UV-filter avobenzone
    • Authors: K. Kalister; D. Dolenc; M. Sarakha; O. V. Polyakova; A. T. Lebedev; P. Trebše
      Pages: 1289 - 1293
      Abstract: Abstract We studied the reactions of 4-tert-butyl-4′-methoxydibenzoylmethane (avobenzone), the most common UV filter in formulations of sunscreens, under the conditions of disinfection. Three chlorinated compounds were identified as the main products. Their structures were confirmed by high-performance liquid chromatography-tandem mass spectrometry (HPLC–MS2) with accurate mass measurements and by gas chromatography–mass spectrometry (GC/MS). It was reliably proved, that the substitution involved the double bond of the enolic form of the diketone, rather than the activated aromatic ring, leading to the formation of 2-chloro-1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione and 2,2-dichloro-1-(4-tert-butylphenyl)-3-(4-methoxyphenyl)-1,3-propanedione as the main products. The third identified product was 2-chloro-1-(4-methoxyphenyl)ethanone.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140057
      Issue No: Vol. 71, No. 14 (2016)
       
  • Extraction of information attributes from the mass spectrometric signals
           of air
    • Authors: V. V. Manoilov; A. G. Kuzmin; U. A. Titov
      Pages: 1301 - 1308
      Abstract: Abstract The paper describes a new method of the extraction of information attributes from the processed signals, generalized spectral analysis in an adapted basis. Studies of the functional structure of mathematical foundations and an adaptable classification system of different signal types, including the quadrupole mass spectra of air, were carried out. Algorithms for the synthesis of basis functions adapted to orthogonal transforms of process signals were developed. The use of the method for analytical instrumentation was demonstrated by the processing of mass spectra recorded on a quadrupole mass spectrometer in the analysis of gases exhaled by humans.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140094
      Issue No: Vol. 71, No. 14 (2016)
       
  • Prediction of electron ionization mass spectra of О -alkyl
           methylphosphonothionofluoridates
    • Authors: Yu. I. Morozik; A. V. Dudkin; Yu. V. Tkachuk; I. V. Rybal’chenko; R. V. Khatymov
      Pages: 1319 - 1325
      Abstract: Abstract Electron ionization mass spectra of poorly studied toxic alkyl methylphosphonothionofluoridates and alkyl methylphosphonofluoridates are discussed. It is demonstrated that the compounds are decomposed in accordance with the general scheme of fragmentation of monofunctional organic compounds RX (X is a functional group), proposed previously. At the same time, noticeable differences between the corresponding mass spectra are found. The most important difference occurs in their alkene subspectra containing a peak of alkene ion [R–H]+• and peaks of its decay products. A method was developed for the simulation of mass spectra of unknown alkyl methylphosphonothionofluoridates by transforming available mass spectra of their oxygen analogues.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140100
      Issue No: Vol. 71, No. 14 (2016)
       
  • Tris(2,6-dimethoxyphenyl)methyl carbenium ion as a charge derivatization
           agent for the analysis of primary amines by MALDI mass spectrometry
    • Authors: A. P. Topolyan; D. A. Strizhevskaya; M. S. Slyundina; M. A. Belyaeva; O. M. Ivanova; V. A. Korshun; A. V. Ustinov; I. V. Mikhura; A. A. Formanovsky; R. S. Borisov
      Pages: 1326 - 1331
      Abstract: Abstract A novel derivatization method for the analysis of primary amines by MALDI mass spectrometry is proposed. Tris(2,6-dimethoxyphenyl) methyl carbenium cation reacts smoothly with primary amines, forming permanently charged adducts with the mass increment +359 Da and absorbance in the UV region. The approach was tested on a number of amines, including biologically active compounds and therapeutic agents.
      PubDate: 2016-12-01
      DOI: 10.1134/s106193481614015x
      Issue No: Vol. 71, No. 14 (2016)
       
  • Comparative analysis of the binding of thiacalix[4]arene-monocrown-ethers
           with monovalent metal salts using MALDI mass spectrometry
    • Authors: D. R. Sharafutdinova; O. B. Bazanova; A. A. Murav’ev; S. E. Solov’eva; Z. A. Bredikhina; V. M. Babaev; I. S. Antipin
      Pages: 1352 - 1359
      Abstract: Abstract MALDI mass spectrometry is used for the first time for the rapid assessment of the binding of thiacalix[4]arene-monocrown-ethers with metal cations (Li, Na, K, Cs, Cu, Ag). The work is performed on examples of thiacalix[4]arene-monocrown-ethers in 1,3-alternate conformation with various numbers (m) of ethylene oxide units and various substituents in phenol groups. It is shown that thiacalix[4]arene-monocrown- ethers with m = 3, 4, 5, and 6 bind lithium, sodium, potassium, and cesium cations, respectively; in addition, the binding of cesium cations is stronger in the presence of aromatic substituents in the lower rim of thiacalix[4]arene-monocrown-ethers. Silver cations bind with calixarenes under study more intensely than copper ions. When aromatic substituents are present, the binding of silver cations is stronger than that of alkali metal ions with the studied thiacalix[4]arene-monocrown-ethers.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140148
      Issue No: Vol. 71, No. 14 (2016)
       
  • Synthesis of ion-optical devices for the transportation of charged
           particle beams in mass spectrometers
    • Authors: V. V. Pavlov; N. K. Krasnova
      Pages: 1360 - 1367
      Abstract: Abstract An approach to the creation of corpuscular-optical devices for transforming charged particle beams is discussed. These devices are useful for the optimization and creation of the most convenient configuration of the ion path. The approach relies on an inverse dynamics problem formulated on the basis of the Hamilton–Jacobi equation. Motion in the symmetry plane of a three-dimensional field is considered. The problem is solved by analytical methods. An algorithm for the construction electric fields ensuring particle motion along the desired trajectories is described. It is based on the method of physical analogies. The procedure is illustrated by an example. The calculated two-dimensional potential is extended to the 3D-space by a power series on the transverse coordinate. A device embodiment example is demonstrated on the basis of the calculated field structure.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140112
      Issue No: Vol. 71, No. 14 (2016)
       
  • Stereospecific fragmentation of starfish polyhydroxysteroids in
           electrospray ionization mass spectrometry
    • Authors: R. S. Popov; P. S. Dmitrenok
      Pages: 1368 - 1376
      Abstract: Abstract Electrospray ionization mass spectra and collision-induced dissociation mass spectra in positive and negative ion modes of five polyhydroxysteroid compounds from starfish were studied. Tandem mass spectra exhibit extensive fragmentation, including sequential neutral losses of H2O molecules and cleavages in the tetracyclic nucleus and side chains. The relative intensity of some peaks in tandem mass spectra enables stereoisomers with the different orientations of the hydroxyl group at C15 in the tetracyclic nucleus to be distinguished. Some data on the fragmentation mechanisms were obtained by H–D exchange and mass spectrometry analysis.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140124
      Issue No: Vol. 71, No. 14 (2016)
       
  • GC/MS characterization of monosubstituted hydrazones of glyoxylic acid
           ethyl ester
    • Authors: K. I. Rotaru; I. G. Zenkevich; R. R. Kostikov
      Pages: 1377 - 1380
      Abstract: Abstract Electron ionization mass spectra and gas chromatographic retention indices of a series of newly synthesized N-monosubstituted (alkyl, aryl, allyl) hydrazones of glyoxylic acid ethyl ester RNHN=CHCO2C2H5 were considered. It was shown the hydrazones were partially converted into isomeric (ethoxycarbonyl)methyl diimides during their GC separation (mostly in the heated injector port of the gas chromatograph). The retention indices of these diimides are lower than those of initial hydrazones by 268 ± 26 i.u. The most remarkable feature of these isomers appeared to be the high identity of their mass spectra because of similar rearrangements in molecular ions.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140136
      Issue No: Vol. 71, No. 14 (2016)
       
  • Application of high-performance liquid chromatography/high-resolution mass
           spectrometry to the investigation of sodium
           2,3-disulfanyl-1-propanesulfonate (unithiol) and products of its oxidation
           with hydrogen peroxide
    • Authors: D. O. Kuleshov; T. E. Berezkina; Y. V. Russkikh; E. N. Chernova; Z. A. Zhakovskaya; S. V. Masyukevich; L. N. Gall; N. R. Gall
      Pages: 1381 - 1388
      Abstract: Abstract High-performance liquid chromatography combined with high-resolution mass spectrometry has been used to study the mild oxidation of sodium 2,3-disulfanyl-1-propanesulfonate (unithiol) with hydrogen peroxide. Reference peaks have been identified for the initial substance and reaction products. A possibility of using high-performance liquid chromatography with high-resolution mass spectrometry for the Sokolovskii thiol–disulphide test has been shown.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140082
      Issue No: Vol. 71, No. 14 (2016)
       
  • On the impossibility of double focusing in combined electric and magnetic
           fields homogeneous in Euler’ terms
    • Authors: A. S. Berdnikov; I. A. Averin
      Pages: 1389 - 1391
      Abstract: Abstract The use of Euler’s homogeneous electric and magnetic fields can be a good basis for designing static mass spectrometers capable of operating in a spectrographic mode and enabling recording of mass spectra with a wide mass range in one measurement. It is proved mathematically that, when combined Euler’s homogeneous electric and magnetic fields are used to design a single-cascade mass-spectrometer, the double focusing mode cannot be achieved practically along the entire focal line. It is demonstrated that the use of mass spectrographic schemes in which the electric stage and the magnetic stage are separated is an inevitable solution in the creating of a mass spectrograph with high analytical performance.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140021
      Issue No: Vol. 71, No. 14 (2016)
       
  • A comparison of electrospray tandem mass spectra of some sialic acid
           derivatives: Ion trap and high resolution QqToF mass spectrometers
    • Authors: A. O. Chizhov; A. M. Shpirt; N. Y. Savel’eva; L. O. Kononov
      Pages: 1392 - 1396
      Abstract: Abstract Using O-acetyl-N-acyl derivatives of O-methyl sialoside methyl esters, it was shown that an ion trap and a hybrid analyzer (linear quadrupole–time-of-flight analyzer, reflectron) give comparable, though not identical secondary mass spectra for the [M + Na]+ and [M + K]+ ions. A parallel use of an ion trap and a hybrid QqToF instrument gives information about the fragmentation pathways of ions of sialic acid derivatives under collisional activation. In this case, the sequence of fragmentation may be established using an ion trap, whereas a QqToF instrument offers a possibility of revealing the elemental composition of fragment ions quickly and unequivocally.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816140045
      Issue No: Vol. 71, No. 14 (2016)
       
  • Carbon nanocoatings: A new approach to recording mass spectra of
           low-molecular compounds using surface-assisted laser desorption/ionization
           mass spectrometry
    • Authors: D. S. Kosyakov; E. A. Sorokina; N. V. Ul’yanovskii; E. A. Varakin; D. G. Chukhchin; N. S. Gorbova
      Pages: 1221 - 1227
      Abstract: Abstract A simple and rapid approach to obtaining target plates for the investigation of low-molecularweight compounds by surface-assisted laser desorption/ionization (SALDI) mass spectrometry is proposed. It consists in the vacuum sputtering of a carbon layer with a thickness of about 50 nm onto a metal surface. The resulting coatings are characterized by homogeneity, hydrophobicity, and high mechanical strength, which eliminates a possibility of mass spectrometer contamination. A comparison of the SALDI mass spectra of test compounds recorded using conventional carbon materials and carbon nanocoatings demonstrates advantages of the last named materials, such as high spectral resolution and the absence of spectral interferences at low m/z values.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130086
      Issue No: Vol. 71, No. 13 (2016)
       
  • Highly sensitive determination of 1,1-dimethylhydrazine by
           high-performance liquid chromatography–tandem mass spectrometry with
           precolumn derivatization by phenylglyoxal
    • Authors: S. V. Osipenko; R. S. Smirnov; A. D. Smolenkov; O. A. Shpigun
      Pages: 1228 - 1232
      Abstract: Abstract A new highly sensitive and rapid approach to the determination of 1,1-dimethylhydrazine in natural water is developed (determination range is 0.03–1 μg/L). It is based on the use of high-performance liquid chromatography–tandem mass spectrometry with precolumn derivatization by phenylglyoxal and does not require any preconcentration. Derivatization, chromatographic separation conditions, and tandem mass spectrometry detection parameters are chosen. Intra-day precision of the results of measurements of 1,1- dimethylhydrazine in natural water is 12–16%, and inter-day precision is 16–22%. The lowest limit of detection and the lowest limit of quantification are 0.010 μg/L and 0.030 μg/L, respectively.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130098
      Issue No: Vol. 71, No. 13 (2016)
       
  • A gas chromatography/mass spectrometry study of the conversion of
           alicyclic alcohols on membrane-type catalysts using a pulse microreactor
           implanted into a gas chromatograph injector
    • Authors: R. S. Borisov; N. A. Zhilyaeva; M. M. Ermilova; N. V. Orekhova; A. B. Yaroslavtsev; V. G. Zaikin
      Pages: 1251 - 1259
      Abstract: Abstract A pulse microreactor implanted directly into a gas chromatograph injector combined with a mass spectrometer has been proposed for monitoring the activity of heterogeneous catalysts. The microreactor was made of a standard commercial liner for a particular gas chromatograph and contained a catalytic bed. A heated injector oven was used simultaneously for heating the catalytic region, rapid evaporation of the substrate, and pulsed introduction of reaction products into a chromatographic column. The temperature of the oven could be varied in the range 200–300°C. The method ensures the detailed description of the qualitative composition of the reaction products. The potential of the proposed microreaction system was demonstrated in the study of membrane-type catalysts (nanodiamonds modified by Pt–Ru and Pt–Ni and also catalytic phosphate systems with NASICON structure) in reactions of cyclohexanol, cyclopentanol, and cyclobutanol. The studied heterogeneous catalysts can be divided in two groups. One group (based on nanodiamonds) promotes dehydrogenation reactions. The NASICON catalytic group catalyzes dehydration reactions with the formation of cycloalkenes and dicycloalkyl ethers.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130037
      Issue No: Vol. 71, No. 13 (2016)
       
  • ESI current oscillations for a high-resistivity fluid with the
           simultaneous visualization of the Taylor cone
    • Authors: N. S. Fomina; S. V. Masyukevich; L. N. Gall; N. R. Gall
      Pages: 1260 - 1265
      Abstract: Abstract Low-frequency oscillations occurring in the electrospray of liquids with low electric conductivity were studied. Based on spectral measurements of oscillations in the range of voltages typically used in mass spectrometry, it was shown that the spectrum reveals the control frequency, which accounts for ≈80% of power oscillations, and a set of overtones. The magnitude of the main frequency varies in the range 200–800 Hz and increases with increasing voltage up to breakdown. Immediately after the collapse of oscillations, the most stable spraying mode is realized. A model describing the mechanism of oscillations due to the role of space charge accumulated on the counter electrode was proposed.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130050
      Issue No: Vol. 71, No. 13 (2016)
       
  • Determination of the structural features of O -alkyl- S -2-( N,N
           -dialkylamino) ethyl alkylthiophosphonates from their electron ionization
           mass spectra
    • Authors: A. G. Terentyev; Yu. I. Morozik; I. V. Rybal’chenko; A. V. Dudkin; A. O. Smirnov; G. V. Galyaev
      Pages: 1266 - 1274
      Abstract: Abstract It is believed that information about the molecular structure of highly toxic O-alkyl-S-2(N,N-dialkylamino) ethyl alkylthiophosphonates (V-gases) obtained from their EI mass spectra is too insufficient. In particular, the determination of molecular weights and structures of radicals at phosphorus and oxygen atoms causes great difficulties. In this paper, solutions of these problems are proposed.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130104
      Issue No: Vol. 71, No. 13 (2016)
       
  • GroupFilter: A software tool for efficient filtering of Morpheus search
           engine results
    • Authors: M. V. Ivanov; L. I. Levitsky; A. A. Lobas; M. V. Gorshkov
      Pages: 1275 - 1279
      Abstract: Abstract Morpheus is a search algorithm developed recently for high-resolution tandem mass spectra. According to the developers, its intrinsic property is discriminating short sequence length peptides. Therefore, elimination of direct comparisons between peptide spectrum matches (PSMs) for short and long peptides may potentially increase the search sensitivity for a given FDR level. In the proposed approach, all PSMs are grouped according to the number of matched fragment ions, followed by separate filtering of identifications in each group using target-decoy approach. The approach is applied to Morpheus output results and does not cause a significant increase in the overall data analysis time. The proposed approach was implemented as a Python command-line tool, called GroupFilter. Several data sets from different types of mass spectrometers were used for testing of the software, including the data from the original Morpheus search engine paper. Separate FDR filtering for grouped identifications increased the number of identified peptides by up to 18% compared with the default Morpheus post-processing procedure. The proposed approach can be considered as an addition to the Morpheus search engine.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816130074
      Issue No: Vol. 71, No. 13 (2016)
       
  • Study of the conditions of formation of spectral and absorbption
           multidimensional images of motor fuels and liquid mineral technical oils
    • Authors: A. A. Ganeev; I. O. Konyushenko; V. M. Nemets
      Pages: 1182 - 1187
      Abstract: Abstract Effect of experimental conditions on the possibility of formation of multidimensional images of motor fuels and liquid mineral technical oils used for the classification and identification of these samples by the method of pattern recognition is studied. Transmission spectra are considered as primary images of the studied samples. Multidimensional statistical analysis of the results of spectroscopic measurements is performed by principal component analysis. A noticeable increase in the separation of spectroscopic images on the statistical plane in the optimization of the spectral range of the primary image and the thickness of the absorbing layer is shown.
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816120042
      Issue No: Vol. 71, No. 12 (2016)
       
  • Applicability of the critical chromatography concept to proteomic
           problems. II. Effect of mobile phase on the separation of peptides and
           proteins taking into account the amino acid sequence
    • Authors: A. V. Gorshkov; M. L. Pridatchenko; T. Yu. Perlova; I. A. Tarasova; L. I. Levitsky; M. V. Gorshkov; V. V. Evreinov
      Pages: 1188 - 1197
      Abstract: Abstract The effect of parameters of a binary mobile phase (chemical properties of components, gradient profile, flow rate, and pH) on the separation of peptides and proteins is theoretically investigated using a model of critical chromatography (model BioLCCC). It is demonstrated that the retention volume of peptides can be inverted by changing separation conditions.
      PubDate: 2016-12-01
      DOI: 10.1134/s106193481610004x
      Issue No: Vol. 71, No. 12 (2016)
       
  • Electrophoretic separation of some nucleosides for the diagnosis of
           mastopathy and fibroadenoma
    • Authors: Mingsheng Jiang; A. F. Prokhorova; N. B. Rozhmanova; O. A. Shpigun
      Pages: 1198 - 1203
      Abstract: Abstract Mixtures of 13 normal and modified nucleosides in a 70 mM phosphate buffer solution (pH 6.7) supplemented with 100 mM of sodium dodecyl sulfate were separated by micellar electrokinetic chromatography in 25 min. Electrophoretic profiles of urine are obtained; it is demonstrated that 1-methylinosine and 1-methylguanosine nucleosides can be used as markers of precancerous states (mastopathy) and benign tumors (fibroadenoma).
      PubDate: 2016-12-01
      DOI: 10.1134/s1061934816120091
      Issue No: Vol. 71, No. 12 (2016)
       
 
 
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